clang-tidy - performance-noexcept-move-constructor

The check flags user-defined move constructors and assignment operators not
marked with noexcept or marked with noexcept(expr) where expr
evaluates to false (but is not a false literal itself).

Move constructors of all the types used with STL containers, for example,
need to be declared noexcept. Otherwise STL will choose copy constructors
instead. The same is valid for move assignment operations.